Clamp.



H.v W. HAYFORD.

CLAMP. APPLICATION FILED AUG. 29, 1912.

1,083,880 Patented Ja11.6, 1914.

TUNTTED STATES PATENT OFFTCE.

HERBERT W. HAYFORD, OF LACONIA, NEW' HAMPSHIRE.

CLAMP.

nesasse.

Application iiled August 29, 1912.

To @ZZ 1li/omit muy concern;

Be it known that I, Hnnnnn'r 1V. Hnrronn, a citizen of the United States, residing at Laconia, county of Belknap, State of New Hampshire, have invented an Improvement in Clamps, of which the following description, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention relates to clamps of that type embodying two jaws which are movable toward and from each other by means of a clamping screw, and the principal object of the invention is to provide a novel clamp of this nature in which the jaws can be moved toward and from each other by the action of a single screw, and which is provided with means for automatically maintaining the jaws in parallelism in all adjusted positions thereof.

@ther objects of the invention are to simplify and improve generally clamps of this nature, all as will be more fully hereinafter described and then pointed out in the appended claims.

Referring to the drawings wherein I have shown some embodiments of my invention, Figure 1 is a side view of a clamp embodying the invention; Fig. 2 is an end view thereof; Fig. 3 is a section on the line -m, Fig. 1; Fig. 4 is a sectional detail view showing the manner of swiveling the clamping screws to one of the jaws; Fig. 5 is a view showing a different style of jaw from that shown in Fig. 1.

Referring iirst to Figs. 1 to 4f, 1 and 2 represent the two aws of the clamp between which the work is gripped and 3 is the clamping screw by which the jaws are moved toward and from each other. Tn my invention a single screw only is required for this purpose. The screw 3 is swiveled to the jaw 1 and has screw-threaded engagement with the jaw 2. Said screw is shown as provided with screw-threaded portion 4t which extends through an aperture in the jaw 2 and has screw-threaded engagement therewith, and said portion l eX- tends loosely through an aperture in the jaw 1, as usual in devices of this nature- A connection is provided between the jaw 1 and the screw 3 so that the jaw will be moved backward and forward with the screw while permitting the screw to turn freely in the jaw. The connection herein shown for this purpose comprises a plate 5 Specification of Letters Patent.

Patented Jan. 6, 1914.

Serial No. 717,710.

which is secured to the aw 1 by some suitable means, such as a screw G, and the edge of which is received in a groove 7 formed in the shank of the screw The plate 5 may conveniently be provided with a slot so that when the screw (S is loosened it can be withdrawn from the groove 7 to permit the screw 3 to be entirely removed.

The jaws 1 and 2 are moved toward and from each other by turning the screw 3 one way or the other, as will be obvious. in order to maintain the jaws in parallelism while they are being adjusted toward and from each other, T have provided a novel construction which automatically accomplishes this end without involving any attention on the part of the operator, so that the adjusting of the clamp involves merely the turning of the screw 3. The construction I have herein provided for this purpose and which constitutes the preferred embodiment of my invention comprises two side plates 8 and 9 between which the jaws 1 and 2 are received and which are provided with means for holding the jaws in their required parallel position. Each plate is provided with two sets of slots and each jaw is provided with pins which operate in said slots. The slots of at least one set must lie at an oblique angle to the length of the jaws. The slots of the other set may be parallel to the length of the jaws and the slots 10 with which the projections 11 of the jaw 2 operate, are so shown. Said projections preferably have heads 12 thereon which overlie the plates and prevent them from spreading. The slots which coperate with the jaw 1 are shown at 13 and these lie at an oblique angle to the length of the jaws, as clearly seen in Fig. 1.

11 designate the projections extending from the jaw 1 and operating in the slots 13. The two plates are preferably rigidly connected together by the portion 15 on the under side thereof. although this construction is not essential.

In the operation of the device when the jaws 1 and 2 are moved toward each other the pins or projections 11 ride up the inclined slots 13, while the projections 11 move forwardly in the slots 10. On the other hand7 when the jaws move away from each other the pins 11i move downwardly in the slots 13 and the pins 11 move backwardly in the slots 10. This arrangement of pins and slots is effective in maintaining the jaws articles, l may substitute 'the jaw shown in Fig. 5 for the 'a l. rlhis jaw which is designated '5 ided with the offset portion to whic "reliably secured a ember 91 having porLV n li nged therei o at so that the clamping face 99 thereof an be swung into any desired position, as

by the dotted l'` in ig 5, to accate articles Q tapered or in- 'aces, A-iiis inenihei 91 is detachably n position by a plate SQ, the edge of ich occupies a groove 88 formed on the 4 -eh is held in place by a iiiicipal feature of my invention relates to means for maintaining at all times the jaws in parallelism, and wl'iil l have illustrated the preferred einbodiment of my invention, l do not wish to be limited to the constractional details shown.

Having tliiis lencribed my invention, what l claim as new amd desire to seciire by Letters Patentis l. in a clamp, the combination with two jaws, of a clamping screw eXtendi .O transversely thi'v ugh both aws and having screwtlireaded engagement with one jaw and being swiveled to the other jaw and means indeprising two plates between which the jaws Vare mounted, each plate having two sets of slots and pins extending from said jaws and operating in said slots.

in a clamp., tlie` combination with two l jaws, of means for moving said toward and from each other, two side plates between i ffl" the jaws are received, said side plates ing two lsets of slots, the slots oi one set extending parallel tothe aws and: the slots of the other sethaving an inclined position, and projections extending from the jaws and ceci 'ng said slots. Y i

3. in a clamp, the combination with two jaws, of means for moving said jaws toward "rom each other, two side plates between which the jaws are received, said side plates having two sets of slots, the slots of one set extending parallel to the jaws and the slots oi the other set having an inclined position7 and projections extending from the jaws and occupying said slots, the projections from o'An jaw occupying the slots of one set and ,se from the other jaw the slots of the other set.

ln testimony whereof, l have signed my nanie to this specification, in the presence of two subscribing witnesses.

HVRBERT W. HAYFORD. Y, itnesses l Tnoiinis C. HILL, Grieken B. MUNsEY.

C opiel of this patent may be obtained for five cents'eaci, by addressing tire Commissioner of Patents.

Washington, D. C. 

